Strip punching mechanism



P 26, 1939. G. H. BENZON, JR.. El AL ,457

STRIP PUNCHING MECHANISM 7 Sheets-Sheet 1 Filed April 2, 1958 Sept. 26,1939. G. H. BENZON, JR. ET AL 7 STRIP PUNCHING MECHANISM,

Filed April 2, 1938 7 Shets-Sheet 2 air Snag l l rzvertifirsx $901299HBez-gozz :71

Sept. 26, 1939- I a. H. BENZON, JR. Er AL 2,174,457

STRIP PUNCHING MECHANISM Filed April 2, 1938 7 Sheets-Sheet 3 @0219?EBayoni Sept.

26, 1939. G. H. BENZON, JRL. ETAL STRIP PUNCHING MECHANISM Filed April2, 1938 7 Sheets-Sheet 4 Filed April 2. 1938 G.'H. BENZON; JR.. ET ALSept. 26, 1939.

11621 B. Xu-

5 7} wags y I p 1939- I G. H. BYENZON, JR.. AL 2,174,457

STRIP PUNCHING MECHANISM f 7 Sheets-Sheet 7 Filed April 2, 1938 PatentedSept. 26, 1939 UNITED STATES PATENT OFFICE STRIP PUNCHING MECHANISMWilliam Sellers & Company,

Incorporated,

Philadelphia, Pa, a corporation of Pennsyl- Vania Application April 2,1938, Serial No. 199,709

12 Claims.

This invention relates to strip punching Inachines, and moreparticularly to a punch for use in forming control strips for use in thepaper towers of automatic contouring lathes and the like such as thoseshown in our copending application, Serial No. 199,708, filed of evendate herewith.

An important object of the invention is the provision in a machine ofthis character of a construction permitting a given predetermined toolshape to follow closely a contour lay-out for a given piece of work, andwhich construction will permit the ready correction of any errors madein selection of the movement of the tool 7 pattern.

A further object of the invention is the provision in a construction ofthis character of an arrangement such that the movement of the toolpattern is completed prior to any actual punching operation so that theposition of the pattern may be corrected prior to such punchingoperation.

A further object of the invention is the provision of a construction ofthis character which is extremely simple in its operation and may bereadily manipulated by an ordinary workman with but little instruction.

These and other objects we attain. by the construction shown in theaccompanying drawings, wherein, for the purpose of illustration, we haveshown a preferred embodiment of our invention and wherein:

Fig. 1 is a perspective View of a punching apparatus constructed in.accordance with our invention;

Fig. 2 is a perspective diagram of the type of control mechanism whichis to be operated by the strips produced in the punching machine;

Fig. 2a is a. fragmentary detail of the control strip employed in amachine of the character diagrammed in Fig. 2;

Fig. 3 is a plan view of the table and slide;

Fig. 4 is aside elevation thereof;

Fig. 5 is a plan View of the table control mechanism and strip punchingmeans;

Fig. 6 is a side elevation partially in section of the punch;

Fig. '7 is a sectional view showing the control shafts and the gearingassociated therewith;

Fig. 8 is a section on line 8-8 of Fig. 6;

Fig. 9 is a detail strip produced showing the relative positions of thevarious punched openings produceable with the machine;

Fig. 10 is a semi-diagrammatic section showing in solid lines the normalposition of the parts,

and in dotted lines the positions assumed by a selected operatingelement and the actuating yoke after initial movement of the yoke; and

Fig. 11 is a view similar to that of Fig. 10 with the parts shown insolid lines in the positions 5 they have upon completion of the primaryyoke movement, and in dotted lines after completion of the secondary orpunch-operating yoke movement.

As hereinbefore noted, the machine with which 10 the strips to beproduced by the present invention are to be employed is shown in ourabovenoted copending application for contouring Wheel lathe. This latheand its controls are diagrammatically illustrated in Figs. 2 and 2a. 15

Referring now more particularly to these figures, the numeral Itgenerally designates a suitably driven rotating chuck in which the workpiece H, at present shown as a car wheel, is mounted for the contouringoperation. This chuck may have its axis at any desired angle, in thepresent illustration being horizontally disposed, and associated withthe chuck is a turret assembly 12 comprising a slide l3 and the turretproper, indicated at hi, the latter carrying the 25 cutting tool l5. Theturret proper is movable both perpendicularly and longitudinally to theaxis of the chuck, the perpendicular movement at present beingillustrated as provided through a Worm drive l6 engaging in a nut ll onthe slide it, which slide is mounted in suitable guides i8 extendingtransversely of the lathe bed I9. A second worm, not shown, operatedthrough the medium of a spline shaft 29 serves to shift the turret headI4 upon the slide in a direction 1ongitudinal to the chuck axis. Thesemovements of the turret are all conventional and well known, and need nofurther description or illustration than that here given. Operation ofthe worms is obtained through continuously operating ratchets 2|associated therewith, these ratchets including normally disengaged pawls22, engagement of which is effected through air cylinders 23. A device24, generally termed a paper tower, has a perforated strip 25 fedtherethrough, the perforations of this strip controlling not only theaction of the cylinders 23, but likewise a disengaging clutch 24a. tostop operation of the machine.

The strip 25 is produced in the machine forming the subject matter ofthe present application. This machine comprises a suitable support 26having associated therewith an easel 21 to support a lay-out 28 of thecontour of which it is desired to have the contouring machine or lathereproduce. In the present instance this contour is shown as that of thecar wheel II. Upon the support 26 there is disposed a carriage 29 (Figs.1, 3 and 4) somewhat similar in function to the traveling carriage ofthe lathe and carrying a slide 38 corresponding to the slide l2 of thelathe. Extending longitudinally of the support 26 are guide bars 3! uponwhich the carriage 29 is longitudinally shiftable. These guide bars aresecured at their ends in supports 32 which rotat= ably mount a worm 33and a spline shaft 34 corresponding to the worm l6 and spline shaft 25of the lathe. Extending longitudinally of the carriage is a worm 35extending through a nut 35 on the slide 30. This worm may be eitherrotated by hand through a hand-wheel 31 or may be driven from splineshaft 34 through a gear 38 mounted on the spline shaft and havingdriving connection with a gear 38 secured to worm 35. Detachably securedto the slide for interchange with similar devices is a template 48, theouter end 4| of which is constructed to have the same form as the tooll5 which is to be employed in the contouring machine. For convenience,the upper face of the outer end of the template is marked withdirections corresponding to those in which the slide can be movedthrough the control mechanism about to be described.

It will be obvious that by suitable operations of worms 33 and 35 thetool-simulating inner end of the template 48 may be caused to follow thecontour of the lay-out pattern 28 at present shown as a drawing. Forexample, assuming that the tool is to be fed only into the work, fromits position shown in Fig. 1, the contour would be followed by asimultaneous in and forward movement while from its position shown inFig. 3 the contour would be best followed by alternate reverse and inmotions.

The punch proper, indicated generally at 42 is located at one end of thesupport 26 and comprises spaced side frames 43 connected throughtransverse structure 44, affording a slot 45 for the passage of thestrip 46 from which the control strip 25 is to be formed. At one side ofthis slot a supply roll 41 of the strip material is rotatably supported,a suitable means, such as friction block 48, being employed to retardrotation thereof.

At the opposite side of the slot the frames 43 support a draw roll 49over which the strip 25 passes after punching. Above the slot, the crossmember 44 supports a plurality of spring-elevated punches which may begenerally classified as track punches 50 and operation control punches5|, four of the latter being shown in the present instance. From thepaper draw roll the punched strip is passed to a winding roll 52 whichis driven from the draw roll 48 through step-up gearing 53 and afriction driving clutch 54 permitting relative slip between the roll anddrive. The friction of this clutch may be regulated through anadjustable tension device such -as indicated generally at 55.

Mounted in the side members 43 adjacent the top thereof is a shaft 56which, between the side members bears av yoke frame 51 including atransverse cross bar 58 overlying the track punches and the operationpunches. This cross arm bears fixed operating pins 59 for engagementwith the track punches 50 and loosely mounted pins 60 for cooperationwith the operation control punches 5|, means being provided, ashereinafter more fully set forth, for selectively locking these slidablymounted pins aganst movement with relation to the cross arm.

At its outer end the shaft 56 has secured thereto an operating arm 6|through which the shaft may be oscillated and the cross arm of the yoke,accordingly, elevated or depressed to bring the pins into engagementwith the punches. This arm is normally kept in its elevated positionthrough a spring 62 surrounding a rod 63 which, at its upper end, ispivoted to arm 6!, and adjacent its lower end passes through a guide 64.At its lower end, the rod 63 is pivoted to an arm 85 pivoted upon theshaft of draw roll 49. The connection between this arm and the rodmounts a pawl 66 cooperating with the gear 51 secured to the shaft ofthe draw roll. This pawl is so constructed that during downward movementof arm 8| it rides over the teeth of the gear and during upward movementthereof it rotates the same, thereby advancing the paper strip throughone step, pawl 68 preventing return movement of the gear. To assist inpreventing this return movement and any possible movement of the drawroll through slack in pawl connections, or the like, the shaft 69 ofthis draw roll is equipped with a tension spring 18 and an adjustingdevice H therefor whereby the roll may be drawn firmly against itsbearings.

At their inner ends, the side frames 43 support shafts 12 and I3aligning respectively with the worm shaft 33 and the spline shaft 34,and connected thereto by collars l4, shaft 12 having an operating handle15 through which the worm shaft 33 may be manually rotated.

Shaft 12 has mounted thereon ratchet discs '16, 11, 18 and I9, andadjacent each of these ratchet discs mounts a lever for each disc. Eachlever 88 is in the form of a bell crank, the arms of which arealternately adapted to engage against stops 8| and Bla, the stops Bid atpresent shown as in the form of a transversely-extending shaft and thestops 8| in the form of screws adjustably directed through these shafts.The arm of each lever which is adapted to engage the stop Bl has pivotedthereto at 82 a pawl 83 for engagement with the associated ratchet andto this pawl, in turn, is pivoted the lower end of a link 84. Links 84are each formed in two sections which are slidably engaged with oneanother at 85 and are held in a normally collapsed condition throughsprings 86. The upper end of the upper section of each link is pivotedat 8! to the tail of a lever 88 loosely pivotedupon the shaft 58 andhaving its forward end overlying the yoke. These levers will hereinafterbe referred to, for the purpose of identification, as the forward, in,reverse, and out levers, corresponding to the various operation controlmovements of slide 30.

The forward, in, and reverse levers adjacent their forward ends overliethe upper ends of the three left-hand pins 60 for coaction therewith andtheir forward extremities are provided with rotatable buttons 89 bymeans of which they may be locked to the yoke. When the forward end of agiven, lever is locked to the yoke, its corresponding pin 60 is heldagainst upward movement and, accordingly, will actuate the associatedpunch when it comes in contact therewith. The out lever does not coactwith a pin 68 and merely has its end closely overlying the yoke so thatit cannot be moved downwardly unless the yoke is in lowered position,and this lever is not equipped with the locking device of the forward,in and reverse levers.

prevent upward movement thereof.

Associated with the fourth, or right-hand, loose pin 60, is a rotatablebutton 90 having an arm SI which, through rotation of the button, may becaused to overlie the upper end of this pin and It will be obvious thatwhen any of the forward, in, or reverse levers is locked to the yoke,and the yoke is operated, not only will the associated pin 66 actuatethe corresponding punch but the lever will be caused to rotate, therebyactuating the associated link 84 and the ratchet mechanism to which itis connected, thus causing a corresponding operation of the associatedratchet disc 16, H or IE. Ratchet discs I6 and 18 are loosely mounted onshaft 12 and are geared at 92 to shaft 13, and the ratchets associatedwith these discs act oppositely thereupon so that when one ratchet isactuated shaft 13 is rotated in one direction and when the other isactuated this shaft is operated in the opposite direction, therefore,moving the slide 30 in or out as selected. Movements of these ratchetsare obtained through operation of the in and out levers. Ratchets l! and19 are directly keyed to shaft 12, and the ratchet wheels associatedtherewith are reversely disposed so that reverse operations of the worm33 are obtained by operation of the forward and reverse levers. Levers88 are normally held in their lowered positions through tension springs93 connected between a cross bar 94 and these levers.

The punching operations of which the present machine is capable areillustrated in Fig. 9. It will be obvious that to obtain the in, forwardor reverse movements it is simply necessary to lock the lever 88corresponding to these movements to the yoke and then depress the arm orif combination of either forward or reverse movement with an in movementis desired, to simultaneously lock in and forward or reverse levers tothe yoke, as likewise shown by the punching indications on Fig. 9. For astop operation, the stop button is rotated to cause its arm 9| tooverlie the associated pin. Each operation of the lever will result inthe formation of track openings to be engaged by the track pins 49a ofthe draw roll and by the corresponding pins of the paper tower 24.

It will be obvious that, since the selections for movement of thecarriage are entirely a matter of judgment of the operator, it willoften occur that a selection will be erroneous, necessitating resettingof the mechanism before the actual punching occurs. The mechanismhereinbefore described not only enables the operator to reset themechanism, but provides a warning of the initiation of the actualpunching operation.

Examining Figures and 11, it will be noted that while the pawl 83 is, inthe lowered position of link 84, held out of engagement with itsassociated ratchet, a primary movement thereof engages the pawl with theratchet swinging the pawl about the pivot 82 upon the lever 80. As shownin Fig. 11, continued upward movement of link 84 rotates the ratchetdisc effecting the operation of the shaft, and the movement of arm 6|necessary to complete operation of the ratchet disc leaves the operatingpin 60 just out of engagement with the associated punch 5|. At this timethe second arm 88a of the bell crank lever 88 has come into engagementwith the stop 8|a, thus preventing further movement of the lower end oflink 84 and holding the ratchet B3 in the associated notch of theratchet disc, preventing further actuation of the shaft which has justbeen operated.

In the final movement of the arm 6| the punch is operated and duringthis operation the spring 86 of link 84 is compressed placing anadditional strain on arm 6| which will serve to warn the operator. Sincethe primary movement of the arm 6| has actuated the shaft, the operatorcan see Whether or not the template 40 is properly following the lay-outdiagram 28 and if it is not he can immediately correct the error. If itis found that the structure has moved in when it should not have beenmoved in, the in button is released to release the lever 88 associatedtherewith and permitted to return to its normal position. 1 Stillholding the arm 6| in its middepressed position, he now engages the outlever with his hand and depresses the forward end thereof, therebyreversing the previous in operation and restoring the mechanism to itsoriginal position. If a forward operation has been mistakenly employed,this may be corrected by permitting the arm 6| to elevate to its normalposition, disengaging the forward lever, engaging the reverse lever andagain partially deressing the arm.

While we have, at present, shown the punching operations as confined toin, forward, reverse and stop, it will be obvious that additionalfunctions of the machine may be controlled by the addition of furthercontrollable punches, the present arrangement being illustrated due tothe fact that ordinarily feeding operations are usually made only intoand across the work, either in a forward or reverse direction.

The construction illustrated being capable of considerable modificationwithout departing from the spirit of the invention, we do not wish to beunderstood as limiting ourselves thereto except as hereinafter claimed.

We claim:

1. Apparatus for producing control strips of the type described, meansto feed a strip to be punched, means to support a pattern, atool-simulating template, means to move said template to follow theoutline of the pattern comprising a plurality of independentlyselectable and actuat able operating elements each of which whenactuated imparts a movement to the template differing from thoseimparted by the remaining elements, an actuator for said operatingelements and to which each element is connected in the selection thereofand a punch for each element actuated by said actuator to punch thestrip only when the corresponding operating element has been selected.

2. A device as claimed in claim 1 wherein the actuator has primary andsecondary movements and the operating elements are moved by the primarymovement thereof while the punches are actuated by the secondarymovement thereof.

3. A device as claimed in claim 1 wherein the actuator has primary andsecondary movements and the operating elements are moved by the primarymovement thereof while the punches are actuated by the secondarymovement thereof, and means to definitely limit movement of a selectedoperating element at the close of the primary movement of the actuator,the connection between the operating element and the actuator comprisinga member yielding to permit the secondary movement of the actuator.

4. Apparatus for producing control strips of the type described, meansto feed a strip to be punched, means to support a pattern, atoolsimulating template, means to move said template to follow theoutline of the pattern comprising a plurality of independentlyselectable and actuatable operating elements each ofwhich when actuatedimparts a movement to the template differing from those imparted by theremaining elements, an actuator for said operating elements and to whicheach element is connected in the selection thereof, a punch for eachoperating element, an operating pin for each punch loosely mounted onthe actuator and means to hold the pin of the corresponding punchagainst movement effective upon selective connection of an operatingelement to the actuator.

5. A device as claimed in claim 4 wherein the actuator has primary andsecondary movements and the operating elements are moved by the primarymovement thereof while the punches are actuated by the secondarymovement thereof.

6. A device as claimed in claim 4 wherein the actuator has primary andsecondary movements and the operating elements are moved by the primarymovement thereof while the punches are actuated by the secondarymovement thereof, and means to definitely limit movement of a selectedoperating element at the close of the primary movement of the actuator,the connection between the operating element and the actuator comprisinga member yielding to permit the secondary movement of the actuator.

'7. Apparatus for producing control strips of the type described, meansto feed a strip to be punched, means to support a pattern, atoolsimulating template, means to move said template to follow theoutline of the pattern comprising a carriage, a shaft to actuate saidcarriage transversely, a slide on said carriage, a shaft to actuate saidslide longitudinally of the carriage, said slide supporting saidtemplate, a plurality of independently selectable and actuatableoperating elements for said shafts each of which when actuated imparts amovement to the slide differing from those imparted by the remainingelements, an actuator for said operating elements and to which eachelement is connected in the selection thereof and a punch for eachoperating element actuated by said actuator to punch the strip only whenthe corresponding element has been selected.

8. A device as claimed in claim 7 wherein the actuator has primary andsecondary movements and the operating elements are moved by the primarymovement thereof while the punches are actuated by the secondarymovement thereof.

9. A device as claimed in claim 7 wherein the actuator has primary andsecondary movements and the operating elements are moved by the primarymovement thereof while the punches are actuated by the secondarymovement thereof, and means to definitely limit movement of a selectedoperating element at the close of the primary movement of the actuator,the connection between the operating element and the actuator comprisinga member yielding to permit the secondary movement of the actuator.

10. Apparatus for producing control strips of the type described, meansto feed a strip to be punched, means to support a pattern, atoolsimulating template, means to move said template to follow theoutline of the pattern comprising a carriage, a shaft to actuate saidcarriage transversely, a slide on said carriage, a shaft to actuate saidslide longitudinally of the carriage, said slide supporting saidtemplate, a plurality of independently selectable and actuatableoperating elements for said shafts each of which when actuated imparts amovement to the slide differing from those imparted by the remainingelements, an actuator for said operating elements and to which eachelement is connected in the selection thereof, a punch for eachoperating element, an operating pin for each punch loosely mounted onthe actuator, and means to hold the pin of the corresponding punchagainst movement effective upon selective connection of an operatingelement to the actuator.

11. A device as claimed in claim 10 wherein the actuator has primary andsecondary movements and the operating elements are moved by the primarymovement thereof while the punches are actuated by the secondarymovement thereof.

12. A device as claimed in claim 10 wherein the actuator has primary andsecondary movements and the operating elements are moved by the primarymovement thereof while the punches are actuated by the secondarymovement thereof, and means to definitely limit movement of a selectedoperating element at the close of the primary movement of the actuator,the connection between the operating element and the actuator comprisinga member yielding to permit the secondary movement of the actuator.

GEORGE I-I. BENZON, JR. HARRY RUSSELL YOUNG.

